Mercurial > sdl-ios-xcode
annotate src/audio/mint/SDL_mintaudio.c @ 821:30168104389f
Date: Sat, 14 Feb 2004 14:52:40 +0200
From: "Mike Gorchak"
Subject: Batch of the QNX6 fixes for the SDL
1. Updated readme.QNX
2. Fixed crashes during intensive window updating under fast machines (got over 200 rectangles for update).
3. Fixed double-buffered fullscreen modes, now it works as needed.
4. Fixed Photon detection algorithm.
5. Fixed HWSURFACE update function.
6. Added SDL_PHOTON_FULLSCREEN_REFRESH environment variable support for control refresh rates under Photon.
7. Added 640x400 fullscreen mode emulation via 640x480 (if videodriver not supports original 640x400 mode of course) shifted by 40 vertical pixels from begin, to center it. It's needed for some old DOS games which ran in doubled 320x200 mode.
8. Added available video ram amount support.
8. Added hardware surface allocation/deallocation support if current videomode and videodriver supports it.
9. Added hardware filling support.
10. Added hardware blits support (simple and colorkeyed).
And I've added to testvidinfo test color-keyed blits benchmark (maybe need to add alpha blits benchmark too ?). Currently Photon not supporting any alpha hardware blittings (all drivers lack of alpha blitting code support, only software alpha blitting exist in photon, which is hundreds times slowest than the SDL's one). So I've not added the alpha support. I suppose new QNX 6.3 will have the hardware alpha support, so when it will be done, I'll add alpha support.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 14 Feb 2004 20:22:21 +0000 |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
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3 Copyright (C) 1997-2004 Sam Lantinga |
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4 |
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5 This library is free software; you can redistribute it and/or |
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6 modify it under the terms of the GNU Library General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2 of the License, or (at your option) any later version. |
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9 |
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10 This library is distributed in the hope that it will be useful, |
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 Library General Public License for more details. |
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14 |
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15 You should have received a copy of the GNU Library General Public |
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16 License along with this library; if not, write to the Free |
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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18 |
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19 Sam Lantinga |
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20 slouken@libsdl.org |
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21 */ |
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22 |
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23 /* |
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24 Audio interrupt variables and callback function |
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25 |
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26 Patrice Mandin |
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27 */ |
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28 |
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29 #include <string.h> |
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30 |
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31 #include "SDL_types.h" |
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32 #include "SDL_audio.h" |
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33 |
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34 #include "SDL_mintaudio.h" |
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35 #include "SDL_mintaudio_stfa.h" |
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36 |
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37 /* The audio device */ |
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38 |
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39 SDL_AudioDevice *SDL_MintAudio_device; |
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40 Uint8 *SDL_MintAudio_audiobuf[2]; /* Pointers to buffers */ |
704 | 41 unsigned long SDL_MintAudio_audiosize; /* Length of audio buffer=spec->size */ |
42 unsigned short SDL_MintAudio_numbuf; /* Buffer to play */ | |
43 unsigned short SDL_MintAudio_mutex; | |
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44 cookie_stfa_t *SDL_MintAudio_stfa; |
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45 |
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46 /* The callback function, called by each driver whenever needed */ |
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47 |
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48 void SDL_MintAudio_Callback(void) |
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49 { |
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50 Uint8 *buffer; |
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51 |
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52 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf]; |
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53 memset(buffer, SDL_MintAudio_device->spec.silence, SDL_MintAudio_device->spec.size); |
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54 |
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55 if ( ! SDL_MintAudio_device->paused ) { |
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56 if ( SDL_MintAudio_device->convert.needed ) { |
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57 SDL_MintAudio_device->spec.callback(SDL_MintAudio_device->spec.userdata, |
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58 (Uint8 *)SDL_MintAudio_device->convert.buf,SDL_MintAudio_device->convert.len); |
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59 SDL_ConvertAudio(&SDL_MintAudio_device->convert); |
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60 memcpy(buffer, SDL_MintAudio_device->convert.buf, SDL_MintAudio_device->convert.len_cvt); |
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61 } else { |
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62 SDL_MintAudio_device->spec.callback(SDL_MintAudio_device->spec.userdata, buffer, SDL_MintAudio_device->spec.size); |
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63 } |
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64 } |
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65 } |
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66 |
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67 /* Simple function to search for the nearest frequency */ |
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68 int SDL_MintAudio_SearchFrequency(_THIS, int falcon_codec, int desired_freq) |
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69 { |
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70 int i; |
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71 |
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72 /* Only 1 freq ? */ |
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73 if (MINTAUDIO_nfreq==1) { |
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74 return(MINTAUDIO_sfreq); |
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75 } |
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76 |
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77 /* Check the array */ |
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78 for (i=MINTAUDIO_sfreq; i<MINTAUDIO_nfreq-1; i++) { |
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79 /* Remove unusable falcon codec frequencies */ |
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80 if (falcon_codec) { |
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81 if ((i==6) || (i==8) || (i==10)) { |
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82 continue; |
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83 } |
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84 } |
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85 |
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86 if (desired_freq >= ((MINTAUDIO_hardfreq[i]+MINTAUDIO_hardfreq[i+1])>>1)) { |
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87 return i; |
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88 } |
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89 } |
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90 |
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91 /* Not in the array, give the latest */ |
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92 return MINTAUDIO_nfreq-1; |
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93 } |